:root{--bg: #0f1419;--card: #1a2332;--accent: #3b82f6;--accent2: #10b981;--text: #e8edf4;--muted: #8b9cb3;--border: #2a3548}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.app-shell{max-width:480px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column}.header{padding:1rem;background:var(--card);border-bottom:1px solid var(--border)}.header h1{font-size:1.25rem}.header p{color:var(--muted);font-size:.85rem}.content{flex:1;padding:1rem 1rem 5.5rem;overflow-y:auto}.page-header{margin-bottom:1rem}.page-header h2{font-size:1.15rem;margin-bottom:.25rem}.page-subtitle{font-size:.85rem;line-height:1.4}.page-context{font-size:.85rem;margin-bottom:1rem;margin-top:-.5rem}.academic-banner{display:flex;justify-content:space-between;align-items:center;gap:.5rem;padding:.6rem .75rem;margin-bottom:1rem;border-radius:10px;background:#3b82f61a;border:1px solid rgba(59,130,246,.35);font-size:.8rem}.academic-banner.warn{border-color:#f59e0b;background:#f59e0b1a}.academic-banner-link{color:var(--accent);font-weight:600;text-decoration:none;white-space:nowrap}.header-academic{display:block;width:100%;margin-top:.35rem;padding:.35rem .5rem;border-radius:8px;border:1px dashed var(--border);background:transparent;color:var(--muted);font-size:.75rem;text-align:left;cursor:pointer}.header-academic:hover{border-color:var(--accent);color:var(--accent)}.settings-tabs{display:flex;gap:.5rem;margin-bottom:1rem;flex-wrap:wrap}.settings-current{margin-bottom:.75rem;padding:.5rem .65rem;border-radius:8px;background:var(--bg);font-size:.85rem}.success{color:var(--accent2);font-size:.85rem;margin-top:.5rem}.tab-bar{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;display:flex;background:var(--card);border-top:1px solid var(--border)}.tab{flex:1;padding:.5rem .2rem;text-align:center;color:var(--muted);text-decoration:none;font-size:.75rem;border:none;background:none;cursor:pointer;display:flex;flex-direction:column;gap:.1rem;align-items:center}.tab.active{color:var(--accent);font-weight:600}.tab-label{font-size:.75rem}.tab-hint{font-size:.6rem;opacity:.85}.tab.active .tab-hint{color:var(--accent);opacity:.9}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem;margin-bottom:.75rem}.card h3{font-size:.95rem;margin-bottom:.5rem}.card p{color:var(--muted);font-size:.85rem}.btn{display:inline-block;padding:.6rem 1.2rem;border-radius:8px;border:none;cursor:pointer;font-weight:600;font-size:.9rem}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:var(--border);color:var(--text)}.btn-block{width:100%;margin-top:.5rem}input,select{width:100%;padding:.6rem;margin:.4rem 0 .8rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text)}label{font-size:.85rem;color:var(--muted)}.wizard-steps{display:flex;gap:.5rem;margin-bottom:1rem}.wizard-step{flex:1;height:4px;border-radius:2px;background:var(--border)}.wizard-step.done{background:var(--accent2)}.wizard-step.current{background:var(--accent)}.chip{display:inline-block;padding:.3rem .6rem;margin:.2rem;border-radius:999px;font-size:.75rem;background:var(--border)}.chip.selected{background:var(--accent);color:#fff}.check-row{display:flex;align-items:center;gap:.5rem;padding:.5rem 0}.check-row input{width:auto;margin:0}.exam-option{display:block;width:100%;text-align:left;padding:.75rem;margin:.4rem 0;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer}.exam-option.selected{border-color:var(--accent);background:#1e3a5f}.error{color:#f87171;font-size:.85rem;margin:.5rem 0}.success{color:var(--accent2);font-size:.85rem}.muted{color:var(--muted);font-size:.85rem}.wizard-nav{display:flex;gap:.5rem;margin-top:1rem}.wizard-nav .btn{flex:1;margin-top:0}.header-actions{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.5rem}.header-row{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem}.session-email{color:var(--muted);font-size:.8rem;margin-top:.35rem}.sign-out-link{margin-top:.75rem;opacity:.9}.btn-sm{padding:.35rem .65rem;font-size:.75rem}.trial-note{background:#1e3a5f;border:1px solid var(--accent);border-radius:8px;padding:.75rem;margin-bottom:1rem;font-size:.85rem;line-height:1.45}.trial-banner{border-color:var(--accent2)}.plan-option{display:flex;align-items:flex-start;gap:.6rem;padding:.75rem;margin:.5rem 0;border:1px solid var(--border);border-radius:8px;cursor:pointer}.plan-option input{width:auto;margin:.2rem 0 0}.plan-option:has(input:checked){border-color:var(--accent);background:#1e3a5f}textarea{width:100%;padding:.6rem;margin:.4rem 0 .8rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);min-height:4rem;font-family:inherit}.exam-tabs{display:flex;gap:.4rem;margin-bottom:1rem;flex-wrap:wrap}.exam-top-bar{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:.75rem}.exam-progress{height:4px;background:var(--border);border-radius:2px;margin-bottom:1rem;overflow:hidden}.exam-progress-fill{height:100%;background:var(--accent);transition:width .2s}.exam-question-card{min-height:200px}.exam-q-num{color:var(--muted);font-size:.8rem;margin-bottom:.5rem}.exam-q-text{font-size:1rem;line-height:1.5;margin-bottom:1rem}.exam-opt-label{font-weight:700;margin-right:.5rem}.exam-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(70px,1fr));gap:.75rem;margin:1rem 0;text-align:center}.exam-stats strong{display:block;font-size:1.1rem}.exam-stats span{font-size:.7rem;color:var(--muted)}.exam-review.correct{border-color:var(--accent2)}.exam-review.wrong{border-color:#f87171}.study-response{border-color:var(--accent)}.study-page{max-width:100%}.study-layout{display:grid;grid-template-columns:180px 1fr;gap:.75rem}@media (max-width: 640px){.study-layout{grid-template-columns:1fr}.study-sessions{display:none}}.study-sessions{padding:.75rem;max-height:70vh;overflow-y:auto}.study-session-item{display:flex;flex-direction:column;align-items:flex-start;width:100%;text-align:left;padding:.5rem;margin-top:.35rem;border:1px solid var(--border);border-radius:8px;background:transparent;color:inherit;cursor:pointer;font-size:.8rem}.study-session-item.active{border-color:var(--accent);background:#6366f114}.study-session-item small{color:var(--muted)}.study-chat{display:flex;flex-direction:column;min-height:420px}.study-messages{flex:1;overflow-y:auto;max-height:50vh;margin-bottom:.75rem}.study-msg{padding:.6rem .75rem;border-radius:10px;margin-bottom:.5rem;max-width:92%}.study-msg.user{background:#6366f126;margin-left:auto}.study-msg.assistant{background:var(--card);border:1px solid var(--border)}.study-status{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;font-size:.85rem;margin-bottom:.75rem;padding:.6rem .75rem}.study-status.active{border-color:var(--accent2)}.study-badge{font-size:.7rem;padding:.15rem .4rem;border-radius:4px;background:var(--border)}.study-quick{display:flex;flex-wrap:wrap;gap:.35rem;margin-bottom:.5rem}.study-input-row{display:flex;gap:.5rem;align-items:flex-end}.study-input-row textarea{flex:1}.study-sources{margin-top:.5rem;display:flex;flex-wrap:wrap;gap:.35rem}.study-sources a{font-size:.75rem;color:var(--accent)}.study-dual-panel{margin-top:.5rem}.study-dual-toggle{font-size:.75rem;background:none;border:none;color:var(--accent);cursor:pointer;padding:0}.study-dual-details{margin-top:.35rem;font-size:.8rem;color:var(--muted)}.study-dual-details p{white-space:pre-wrap;margin:.25rem 0 .5rem}.ai-generate-card{border-color:var(--accent)}.ai-generate-card h3{font-size:.95rem;margin-bottom:.35rem}